Download Evaluates: MAX4952A Evaluation Kit General Description Features

19-4919; Rev 0; 8/09
MAX4952A Evaluation Kit
Features
The MAX4952A evaluation kit (EV kit) provides a proven
design to evaluate the MAX4952A dual-channel buffer.
The EV kit contains four sections: an application circuit,
characterization circuit, and two calibration traces.
S Application Circuit with SAS and SATA Input/
The application circuit (Figure 1a) is designed to demonstrate the MAX4952A IC’s use in redriving SerialAttached SCSI (SAS) and Serial ATA (SATA) signals.
This section of the EV kit operates from an external +5V
supply that is regulated by an on-board LDO to +3.3V,
which powers the MAX4952A (U1) device. All traces in
the application circuit are 100I differential controlledimpedance traces.
S Calibration Traces (50I Single-Ended Load Trace
The characterization circuit (Figure 1b) is provided for
eye diagram evaluation using SMA connectors and 50I
single-ended controlled-impedance traces. This section
is powered by an external +3.3V supply.
Output
S Eye Diagram Test Circuit with SMA Inputs/
Outputs
and 50I Single-Ended Through Trace)
S Lead(Pb)-Free and RoHS Compliant
S Proven PCB Layout
S Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX4952AEVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
JU1–JU10
10
3-pin headers, 0.1in centers
C1–C12, C19–
C26, C32–C35
24
0.01FF Q10%, 25V X7R ceramic
capacitors (0402)
Murata GRM155R71E103KA
TDK C1005X7R1E103K
JU11
1
2-pin header, 0.1in centers
P1–P10
10
Edge-mount receptacle SMA
connectors
C13–C16, C27–
C30
8
2.2FF Q10%, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71A225K
2
1FF Q10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C105K
TDK C1608X7R1C105K
C17, C31
C18
1
0.1FF Q10%, 16V X7R ceramic
capacitor (0402)
Murata GRM155R71C104K
TDK C1005X7R1C104K
D1
1
Green LED (0603)
H1
1
Disk-drive power connector
J1, J2
2
7-position SAS vertical
connectors
DESCRIPTION
R1
1
200I Q5% resistor (0603)
R2, R3
2
49.9I Q1% resistors (0603)
U1, U2
2
1.5/3.0/6.0GT/s SAS/SATA
redrivers (28 TQFN-EP*)
Maxim MAX4952ACTI+
U3
1
3.3V regulator (6 SOT23)
Maxim MAX6329TPUT-T+
(Top Mark: AAIP)
—
11
Shunts
—
1
PCB: MAX4952A EVALUATION
KIT+
*EP = Exposed pad.
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Murata Electronics North America, Inc.
770-436-1300
www.murata-northamerica.com
TDK Corp.
847-803-6100
www.component.tdk.com
Note: Indicate that you are using the MAX4952A when contacting these component suppliers.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Evaluates: MAX4952A
General Description
Evaluates: MAX4952A
MAX4952A Evaluation Kit
Quick Start (Application Circuit)
• MAX4952A EV kit
Recommended Equipment
• +5V power supply
• Two SAS/SATA cables
• SAS/SATA device (e.g., a hard drive)
• SAS/SATA host (e.g., a PC)
Procedure
The MAX4952A EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1) V
erify that all jumpers are in their default position, as
shown in Table 1.
2) If testing in a SATA environment, change the shunt on
jumper JU6 to the 1-2 position.
3) C
onnect the first SAS/SATA cable from the PC to the
host connector (J1) on the EV kit.
4) C
onnect the second SAS/SATA cable from the device
connector (J2) to the SAS/SATA device.
5) V
erify communication between the host PC and SAS/
SATA device.
Detailed Description of Hardware
The MAX4952A evaluation kit (EV kit) evaluates the
MAX4952A dual-channel buffer. The MAX4952A is
designed to redrive Serial-Attached SCSI (SAS) or
Serial ATA (SATA) signals. The EV kit is divided into four
Table 1. Default Shunt Positions
JUMPER
SHUNT POSITION
JU1–JU4, JU7,JU8, JU10
2-3
JU5, JU9
1-2
JU6
2-3 (SAS)
JU11
Installed
sections: application circuit, characterization circuit,
and two calibration traces.
The application circuit utilizes 100I differential controlled impedance traces and provides two SAS connectors (J1 and J2), allowing for evaluation of the MAX4952A
in a SAS environment. The characterization circuit utilizes 50I single-ended, controlled-impedance traces and
SMA input/output connectors, allowing for eye diagrams,
and input/output return-loss measurements.
The lower-half of the EV kit provides two sets of calibration traces (Figure 1c), all of which are matched to the
trace lengths in the characterization circuit. These traces
provide a reference for determining the performance of
only the MAX4952A device when evaluated in the characterization circuit.
Application Circuit (U1)
The application circuit provides the means for evaluating
the MAX4952A in a SAS/SATA application. This section
of the EV kit provides two SAS/SATA connectors (J1 and
J2), one for connection to a SAS/SATA host (e.g., a PC)
and the other for connection to a SAS/SATA device (e.g.,
a hard drive).
Power Supply (VIN)
The application circuit must be powered by +3.3V. There
are two ways to get this voltage, either the on-board LDO
(U3) or an external +3.3V power supply. When using the
on-board voltage regulator, the LDO can be powered by
the 4-pin Molex connector (H1) or by a +5V external supply connected to the VIN and GND pads. When using the
on-board LDO to supply power, there is a power LED
(D1) to indicate the presence of +3.3V at VCC.
The user can also connect directly to a +3.3V supply,
which is available on a SAS power connector. The shunt
should be removed from jumper JU11 and a wire connected from the SAS power pin to pin-2 (right-most pin)
of jumper JU11 (see Table 2).
Table 2. Jumper JU11 Function
SHUNT POSITION
VCC PIN (U1)
Installed*
Connected to on-board LDO output
Not installed
Connected to external supply
DESCRIPTION
U1 powered by LDO output (+3.3V)
Powered by +3.3V from an external supply or SAS
power connector
*Default position.
2 _______________________________________________________________________________________
MAX4952A Evaluation Kit
Device Enable (JU5)
The MAX4952A (U1) is enabled/disabled by configuring jumper JU5 (see Table 4). When disabled, the
MAX4952A buffers are disabled and the part is placed in
a low-power standby mode.
Input Equalization (JU1, JU3)
The MAX4952A host and device can be evaluated with
or without input equalization. Configure JU1 to enable/
disable the host input (IN0P, IN0M) equalization and JU3
to enable/disable the device input (IN1P, IN1M) equalization (see Tables 5 and 6).
Table 3. Jumper JU6 Function
SHUNT POSITION
MODE PIN (U1)
1-2
Connected to +3.3V
2-3*
Connected to GND
Not installed
Not connected
DESCRIPTION
Signal type: SATA
Signal type: SAS
*Default position.
Table 4. Jumper JU5 Function
SHUNT POSITION
EN PIN (U1)
DESCRIPTION
1-2*
Connected to +3.3V
Buffers enabled for normal operation
2-3
Connected to GND
Not installed
Not connected
Buffers disabled and device is in low-power standby
mode
*Default position.
Table 5. Jumper JU1 Function
SHUNT POSITION
EQ0 PIN (U1)
1-2
Connected to +3.3V
2-3*
Connected to GND
Not installed
Not connected
DESCRIPTION
Host equalization enabled
Host equalization disabled
*Default position.
Table 6. Jumper JU3 Function
SHUNT POSITION
EQ1 PIN (U1)
1-2
Connected to +3.3V
2-3*
Connected to GND
Not installed
Not connected
DESCRIPTION
Device equalization enabled
Device equalization disabled
*Default position.
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Evaluates: MAX4952A
Mode Control (JU6)
The MAX4952A device can also be used to redrive
Serial ATA (SATA) signals. The MODE pin configures the
device to operate with SATA or SAS signals. See Table 3
for jumper JU6 functions.
Evaluates: MAX4952A
MAX4952A Evaluation Kit
Output Preemphasis (JU2, JU4)
The MAX4952A host and device can be evaluated with
or without output preemphasis. Configure JU2 to enable/
disable the host output preemphasis and JU4 to enable/
disable the device output preemphasis (see Tables 7
and 8).
Characterization Circuit (U2)
The characterization circuit is provided as a separate
test circuit for eye diagram evaluation of the MAX4952A
IC. This circuit provides differential SMA inputs and
outputs with 50I single-ended, controlled-impedance
traces. Channel 1 is not utilized in this section of the EV
kit, but provides the same performance as Channel 0.
Power Supply (VCC)
The characterization circuit is powered by an external
+3.3V power supply connected between the VCC and
GND pads.
Mode Control (JU10)
The MAX4952A device (U2) can also be used to redrive
Serial ATA (SATA) signals. The MODE pin configures the
device to operate with SATA or SAS signals (see Table 9
for jumper JU10 functions).
Device Enable (JU9)
The MAX4952A (U2) is enabled/disabled by configuring jumper JU9 (see Table 10). When disabled, the
MAX4952A buffers are disabled and the part is placed
in a low-power standby mode.
Table 7. Jumper JU2 Function
SHUNT POSITION
PE0 PIN (U1)
1-2
Connected to +3.3V
2-3*
Connected to GND
Not installed
Not connected
DESCRIPTION
Host preemphasis enabled
Host preemphasis disabled
*Default position.
Table 8. Jumper JU4 Function
SHUNT POSITION
PE1 PIN (U1)
1-2
Connected to +3.3V
2-3*
Connected to GND
Not installed
Not connected
DESCRIPTION
Device preemphasis enabled
Device preemphasis disabled
*Default position.
Table 9. Jumper JU10 Function
SHUNT POSITION
MODE PIN (U2)
1-2
Connected to VCC (+3.3V)
2-3*
Connected to GND
Not installed
Not connected
DESCRIPTION
Signal type: SATA
Signal type: SAS
*Default position.
Table 10. Jumper JU9 Function
SHUNT POSITION
EN PIN (U2)
1-2*
Connected to VCC (+3.3V)
2-3
Connected to GND
Not installed
Not connected
DESCRIPTION
Buffers enabled for normal operation
Buffers disabled and device is in low-power standby mode
*Default position.
4 _______________________________________________________________________________________
MAX4952A Evaluation Kit
Output Preemphasis (JU8)
The MAX4952A channel 0 can be evaluated with or
without preemphasis. Configure JU8 to enable/disable
channel 0 preemphasis.
Calibration Traces
The bottom-half of the EV kit provides two sets of calibration traces, which can be used for further analysis.
The lengths of the calibration traces are matched to the
traces going from the SMA connector to MAX4952A (U2)
of the characterization circuit. The first calibration trace
includes a 50I single-ended load termination and the
second calibration trace is a through trace.
Table 11. Jumper JU7 Function
SHUNT POSITION
EQ0 PIN (U2)
1-2
Connected to VCC (+3.3V)
2-3*
Connected to GND
Not installed
Not connected
DESCRIPTION
Channel 0 equalization enabled
Channel 0 equalization disabled
*Default position.
Table 12. Jumper JU8 Function
SHUNT POSITION
PE0 PIN (U2)
1-2
Connected to VCC (+3.3V)
2-3*
Connected to GND
Not installed
Not connected
DESCRIPTION
Channel 0 preemphasis enabled
Channel 0 preemphasis disabled
*Default position.
_______________________________________________________________________________________ 5
Evaluates: MAX4952A
Input Equalization (JU7)
The MAX4952A channel 0 can be evaluated with or without input equalization. Configure JU7 to enable/disable
channel 0 equalization.
Evaluates: MAX4952A
MAX4952A Evaluation Kit
Figure 1a. MAX4952A EV Kit Schematic—Application Circuit (Sheet 1 of 3)
6 _______________________________________________________________________________________
MAX4952A Evaluation Kit
Evaluates: MAX4952A
Figure 1b. MAX4952A EV Kit Schematic—Characterization Circuit (Sheet 2 of 3)
Figure 1c. MAX4952A EV Kit Schematic—Calibration Traces (Sheet 3 of 3)
_______________________________________________________________________________________ 7
Evaluates: MAX4952A
MAX4952A Evaluation Kit
Figure 2. MAX4952A EV Kit Component Placement Guide—
Component Side
Figure 3. MAX4952A EV Kit PCB Layout—Component Side
8 _______________________________________________________________________________________
MAX4952A Evaluation Kit
Evaluates: MAX4952A
Figure 4. MAX4952A EV Kit PCB Layout—Inner Layer 2
Figure 5. MAX4952A EV Kit PCB Layout—Inner Layer 3
_______________________________________________________________________________________ 9
Evaluates: MAX4952A
MAX4952A Evaluation Kit
Figure 6. MAX4952A EV Kit PCB Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
10
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